After watching Kaiji I made a complete ristricted Rock, paper, scissors simulator on my TI-84. It copied the game perfectly, with the stars, cards, scoreboard, and other such rules just like in the show. I also added 99 opponents who you could spy on, form alliances with and betray or buy up cards. And, to make it completely awesome, I also left the loan system intact, so you can sell or buy stars after the game ends and have to try to earn off your initial (random) debt.

A TI-84 is a calculator, you double weeaboos. Programming on it is piss easy. It might not look nice considering the only graphics it has is an oversimplified top-down view of the playing table, but it works.